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Planck's Dusty GEMS. II. Extended [CII] emission and absorption in the Garnet at z=3.4 seen with ALMA

Nicole Nesvadba ; Rüdiger Kneissl ; Raoul Canameras ; Edith Falgarone ; Frederic Boone ; Brenda Frye ; Maryvonne Gerin ; Sabine König (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Guilaine Lagache ; Emeric Le Floc'h ; Sangeeta Malhotra ; Douglas Scott
Astronomy and Astrophysics (0004-6361). Vol. 593 (2016), p. L2.
[Artikel, refereegranskad vetenskaplig]

We present spatially resolved ALMA [CII] observations of the bright (flux density S350 = 400 mJy at 350 μm), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z = 3.427, the "Garnet". This source is part of our set of "Planck's Dusty GEMS", discovered with the Planck's all-sky survey. Two emission-line clouds with a relative velocity offset of ~600 km s-1 extend towards north-east and south-west, respectively, of a small, intensely star-forming clump with a star-formation intensity of 220 M⊙ yr-1 kpc-2, akin to maximal starbursts. [CII] is also seen in absorption, with a redshift of +350 km s-1 relative to the brightest CO component. [CII] absorption has previously only been found in the Milky Way along sightlines toward bright high-mass star-forming regions, and this is the first detection in another galaxy. Similar to Galactic environments, the [CII] absorption feature is associated with [CI] emission, implying that this is diffuse gas shielded from the UV radiation of the clump, and likely at large distances from the clump. Since absorption can only be seen in front of a continuum source, the gas in this structure can definitely be attributed to gas flowing towards the clump. The absorber could be part of a cosmic filament or merger debris being accreted onto the galaxy. We discuss our results also in light of the on-going debate of the origin of the [CII] deficit in dusty star-forming galaxies.

Nyckelord: galaxies: high-redshift, Galaxy: formation, galaxies: ISM, galaxies: starburst, galaxies: kinematics and dynamics, infrared: galaxies

Denna post skapades 2016-12-02. Senast ändrad 2016-12-09.
CPL Pubid: 245806


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)


Extragalaktisk astronomi

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